Date: Mon, 18 Feb 2013 03:35:19 +0000 From: John <jwd@FreeBSD.org> To: FreeBSD Virtualization <freebsd-virtualization@freebsd.org> Subject: ReadOnly iSCSI disk with Virtualbox? Message-ID: <20130218033519.GA34629@FreeBSD.org>
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Hi Folks,
I've been using VB with iSCSI disks hosted on a FreeBSD system
using istgt for a while with no problems. The system hosting
VB is fbsd9.1.
Recently I wanted to use a single zvol and export it to 100+
VB systems in ReadOnly mode. The OS on the way up recognizes the
hd is R/O and mounts a tmpfs filesystem for those areas that need
it. My thoughts on enforcing the ReadOnly disk:
1. Attach the iSCSI drive with "--mtype readonly"
2. Export the zvol with the istgt option "ReadOnly Yes"
Unfortunately, neither of the above work. #1 fails to attach
the disk to the VM:
VBoxManage storageattach $vmname --storagectl "SATA Controller" \
--type hdd \
--port $devport --device 0 \
--medium iscsi \
--server $ip \
--tport $port \
--target $iqn \
--mtype shareable \
--initiator $initiator
VBoxManage: error: Cannot change type for medium '192.168.22.231|iqn.2012-02.com.example:jwd1:1' to 'Readonly' since it is a hard disk
VBoxManage: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component Medium, interface IMedium, callee nsISupports
VBoxManage: error: Context: "COMSETTER(Type)(mediumType)" at line 678 of file VBoxManageStorageController.cpp
VBoxManage: error: Failed to set the medium type
The #2 option also fails:
The attach of the hard drive succeeds, the failure occurs when the
virtual machine is started:
VBoxHeadless --startvm jwd1
...
Error: failed to start machine. Error message: VD: error VERR_VD_IMAGE_READ_ONLY opening image file '172.21.22.231|iqn.2012-02.com.sas.unx:jwd1:1' (VERR_VD_IMAGE_READ_ONLY).
Failed to open image '172.21.22.231|iqn.2012-02.com.sas.unx:jwd1:1' in read-write mode rc=VERR_VD_IMAGE_READ_ONLY (VERR_VD_IMAGE_READ_ONLY).
Failed to attach driver below us! Image is read-only. (VERR_VD_IMAGE_READ_ONLY).
AHCI: Failed to attach drive to Port0 (VERR_VD_IMAGE_READ_ONLY)
Has anyone else tried doing this and/or have a different of
approaching the problem? Or, do I need to start patching code?
Any thoughts are appreciated.
Thanks,
John
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